package com.ruoyi.generator.service;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.constant.GenConstants;
import com.ruoyi.common.core.page.PageDomain;
import com.ruoyi.common.core.page.TableSupport;
import com.ruoyi.common.core.text.CharsetKit;
import com.ruoyi.common.exception.CustomException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.SecurityUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.common.utils.sql.SqlUtil;
import com.ruoyi.generator.dao.GenTableColumnDao;
import com.ruoyi.generator.dao.GenTableDao;
import com.ruoyi.generator.domain.GenTable;
import com.ruoyi.generator.domain.GenTableColumn;
import com.ruoyi.generator.util.GenUtils;
import com.ruoyi.generator.util.VelocityInitializer;
import com.ruoyi.generator.util.VelocityUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.*;
import java.util.stream.Collectors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 业务 服务层实现
 *
 * @author ruoyi
 */
@Transactional(readOnly = true)
@Slf4j
@Service
public class GenTableServiceImpl implements IGenTableService {

    @Autowired
    private GenTableDao genTableDao;

    @Autowired
    private GenTableColumnDao genTableColumnDao;

    /**
     * 查询业务信息
     *
     * @param id 业务ID
     * @return 业务信息
     */
    @Override
    public GenTable selectGenTableById(Long id) {
        Optional<GenTable> tableOptional = genTableDao.findById(id);
        if (!tableOptional.isPresent()) {
            return new GenTable();
        }
        GenTable genTable = tableOptional.get();
        List<GenTableColumn> genTableColumns = genTableColumnDao.findByTableId(genTable.getTableId());
        genTable.setColumns(genTableColumns);
        setTableFromOptions(genTable);
        return genTable;
    }

    /**
     * 查询业务列表
     *
     * @param req 业务信息
     * @return 业务集合
     */
    @Override
    public Page<GenTable> selectGenTableList(GenTable req) {
        PageDomain pageDomain = TableSupport.buildPageRequest();
        if (StringUtils.isNotNull(pageDomain.getPageNum()) && StringUtils.isNotNull(pageDomain.getPageSize())) {
            String orderBy = SqlUtil.escapeOrderBySql(pageDomain.getOrderBy());
        }
        Specification<GenTable> example = new Specification<GenTable>() {
            private static final long serialVersionUID = 1L;

            @Override
            public Predicate toPredicate(Root<GenTable> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
                List<Predicate> list = new ArrayList<>();
                if (StringUtils.isNoneBlank(req.getTableName())) {
                    Predicate pre = cb.like(root.get("tableName").as(String.class), "%" + req.getTableName().trim().toLowerCase() + "%");
                    list.add(pre);
                }
                if (StringUtils.isNoneBlank(req.getTableComment())) {
                    Predicate pre = cb.equal(root.get("tableComment").as(String.class), "%" + req.getTableComment().trim().toLowerCase() + "%");
                    list.add(pre);
                }
                if (null != req.getParams().get("beginTime")) {
                    Predicate pre = cb.greaterThanOrEqualTo(root.get("createTime").as(Date.class), DateUtils.parseDate(req.getParams().get("beginTime")));
                    list.add(pre);
                }
                if (null != req.getParams().get("endTime")) {
                    Predicate pre = cb.lessThanOrEqualTo(root.get("createTime").as(Date.class), DateUtils.parseDate(req.getParams().get("endTime")));
                    list.add(pre);
                }
                if (list.isEmpty()) {
                    return null;
                }
                return cb.and(list.toArray(new Predicate[0]));
            }
        };
        Pageable pageable = PageRequest.of(pageDomain.getPageNo(), pageDomain.getPageSize(), Sort.Direction.DESC, Optional.ofNullable(pageDomain.getOrderByColumn()).orElse("createTime"));
        Page<GenTable> page = genTableDao.findAll(example, pageable);
        return page;
    }

    /**
     * 查询据库列表
     *
     * @param genTable 业务信息
     * @return 数据库表集合
     */
    @Override
    public Page<GenTable> selectDbTableList(GenTable genTable) {
        PageDomain pageReq = TableSupport.buildPageRequest();
        Page<GenTable> genTables = genTableDao.findDbTableList(genTable, PageRequest.of(pageReq.getPageNum() - 1, pageReq.getPageSize()));
        return genTables;
    }

    /**
     * 查询据库列表
     *
     * @param tableNames 表名称组
     * @return 数据库表集合
     */
    @Override
    public List<GenTable> selectDbTableListByNames(String[] tableNames) {
        List<GenTable> genTables = genTableDao.findDbTableListByNames(Arrays.asList(tableNames));
        return genTables;
    }

    /**
     * 修改业务
     *
     * @param genTable 业务信息
     * @return 结果
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateGenTable(GenTable genTable) {
        String options = JSON.toJSONString(genTable.getParams());
        genTable.setOptions(options);
        genTable.setUpdateTime(new Date());
        GenTable save = genTableDao.save(genTable);
        if (save != null) {
            for (GenTableColumn cenTableColumn : genTable.getColumns()) {
                cenTableColumn.setUpdateTime(new Date());
                genTableColumnDao.save(cenTableColumn);
            }
        }
    }

    /**
     * 删除业务对象
     *
     * @param tableIds 需要删除的数据ID
     * @return 结果
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteGenTableByIds(Long[] tableIds) {
        genTableDao.deleteByTableIdIn(Arrays.asList(tableIds));
        genTableColumnDao.deleteByTableIdIn(Arrays.asList(tableIds));

    }

    /**
     * 导入表结构
     *
     * @param tableList 导入表列表
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void importGenTable(List<GenTable> tableList) {
        String operName = SecurityUtils.getUsername();
        Date now = new Date();
        try {
            for (GenTable table : tableList) {
                String tableName = table.getTableName();
                GenUtils.initTable(table, operName);
                table.setCreateTime(now);
                GenTable genTable = genTableDao.save(table);
                if (null != genTable) {
                    // 保存列信息
                    List<GenTableColumn> genTableColumns = genTableColumnDao.findDbTableColumnsByName(tableName);
                    for (GenTableColumn column : genTableColumns) {
                        GenUtils.initColumnField(column, table);
                        column.setCreateTime(now);
                        genTableColumnDao.save(column);
                    }
                }
            }
        } catch (Exception e) {
            throw new CustomException("导入失败：" + e.getMessage());
        }
    }

    /**
     * 预览代码
     *
     * @param tableId 表编号
     * @return 预览数据列表
     */
    @Override
    public Map<String, String> previewCode(Long tableId) {
        Map<String, String> dataMap = new LinkedHashMap<>();
        // 查询表信息
        Optional<GenTable> tableOptional = genTableDao.findById(tableId);
        if (!tableOptional.isPresent()) {
            return new HashMap<>();
        }
        GenTable table = tableOptional.get();
        List<GenTableColumn> genTableColumns = genTableColumnDao.findByTableId(table.getTableId());
        table.setColumns(genTableColumns);
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);
        VelocityInitializer.initVelocity();
        VelocityContext context = VelocityUtils.prepareContext(table);
        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates) {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, Constants.UTF8);
            tpl.merge(context, sw);
            dataMap.put(template, sw.toString());
        }
        return dataMap;
    }

    /**
     * 生成代码（下载方式）
     *
     * @param tableName 表名称
     * @return 数据
     */
    @Override
    public byte[] downloadCode(String tableName) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        generatorCode(tableName, zip);
        IOUtils.closeQuietly(zip);
        return outputStream.toByteArray();
    }

    /**
     * 生成代码（自定义路径）
     *
     * @param tableName 表名称
     */
    @Override
    public void generatorCode(String tableName) {
        // 查询表信息
        GenTable table = genTableDao.findByTableName(tableName).get();
        List<GenTableColumn> genTableColumns = genTableColumnDao.findByTableId(table.getTableId());
        table.setColumns(genTableColumns);
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);
        VelocityInitializer.initVelocity();
        VelocityContext context = VelocityUtils.prepareContext(table);
        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates) {
            if (!StringUtils.containsAny(template, "sql.vm", "api.js.vm", "index.vue.vm", "index-tree.vue.vm")) {
                // 渲染模板
                StringWriter sw = new StringWriter();
                Template tpl = Velocity.getTemplate(template, Constants.UTF8);
                tpl.merge(context, sw);
                try {
                    String path = getGenPath(table, template);
                    FileUtils.writeStringToFile(new File(path), sw.toString(), CharsetKit.UTF_8);
                } catch (IOException e) {
                    throw new CustomException("渲染模板失败，表名：" + table.getTableName());
                }
            }
        }
    }

    /**
     * 同步数据库
     *
     * @param tableName 表名称
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void synchDb(String tableName) {
        // 查询表信息
        GenTable table = genTableDao.findByTableName(tableName).get();
        List<GenTableColumn> genTableColumns = genTableColumnDao.findByTableId(table.getTableId());
        table.setColumns(genTableColumns);
        List<GenTableColumn> tableColumns = table.getColumns();
        List<String> tableColumnNames = tableColumns.stream().map(GenTableColumn::getColumnName).collect(Collectors.toList());
        List<GenTableColumn> dbTableColumns = genTableColumnDao.findDbTableColumnsByName(tableName);
        List<String> dbTableColumnNames = dbTableColumns.stream().map(GenTableColumn::getColumnName).collect(Collectors.toList());
        dbTableColumns.forEach(column -> {
            if (!tableColumnNames.contains(column.getColumnName())) {
                GenUtils.initColumnField(column, table);
                column.setCreateTime(new Date());
                genTableColumnDao.save(column);
            }
        });
        List<GenTableColumn> delColumns = tableColumns.stream().filter(column -> !dbTableColumnNames.contains(column.getColumnName())).collect(Collectors.toList());
        if (StringUtils.isNotEmpty(delColumns)) {
            List<Long> columnIds = delColumns.stream().map(c -> c.getColumnId()).collect(Collectors.toList());
            genTableColumnDao.deleteByColumnIdIn(columnIds);
        }
    }

    /**
     * 批量生成代码（下载方式）
     *
     * @param tableNames 表数组
     * @return 数据
     */
    @Override
    public byte[] downloadCode(String[] tableNames) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        for (String tableName : tableNames) {
            generatorCode(tableName, zip);
        }
        IOUtils.closeQuietly(zip);
        return outputStream.toByteArray();
    }

    /**
     * 查询表信息并生成代码
     */
    private void generatorCode(String tableName, ZipOutputStream zip) {
        // 查询表信息
        GenTable table = genTableDao.findByTableName(tableName).get();
        List<GenTableColumn> genTableColumns = genTableColumnDao.findByTableId(table.getTableId());
        table.setColumns(genTableColumns);

        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);

        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext(table);

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates) {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, Constants.UTF8);
            tpl.merge(context, sw);
            try {
                // 添加到zip
                zip.putNextEntry(new ZipEntry(VelocityUtils.getFileName(template, table)));
                IOUtils.write(sw.toString(), zip, Constants.UTF8);
                IOUtils.closeQuietly(sw);
                zip.flush();
                zip.closeEntry();
            } catch (IOException e) {
                log.error("渲染模板失败，表名：" + table.getTableName(), e);
            }
        }
    }

    /**
     * 修改保存参数校验
     *
     * @param genTable 业务信息
     */
    @Override
    public void validateEdit(GenTable genTable) {
        if (GenConstants.TPL_TREE.equals(genTable.getTplCategory())) {
            String options = JSON.toJSONString(genTable.getParams());
            JSONObject paramsObj = JSONObject.parseObject(options);
            if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_CODE))) {
                throw new CustomException("树编码字段不能为空");
            } else if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_PARENT_CODE))) {
                throw new CustomException("树父编码字段不能为空");
            } else if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_NAME))) {
                throw new CustomException("树名称字段不能为空");
            }
        }
    }

    /**
     * 设置主键列信息
     *
     * @param table   业务表信息
     * @param columns 业务字段列表
     */
    public void setPkColumn(GenTable table, List<GenTableColumn> columns) {
        for (GenTableColumn column : columns) {
            if (column.isPk()) {
                table.setPkColumn(column);
                break;
            }
        }
        if (StringUtils.isNull(table.getPkColumn())) {
            table.setPkColumn(columns.get(0));
        }
    }

    /**
     * 设置代码生成其他选项值
     *
     * @param genTable 设置后的生成对象
     */
    public void setTableFromOptions(GenTable genTable) {
        JSONObject paramsObj = JSONObject.parseObject(genTable.getOptions());
        if (StringUtils.isNotNull(paramsObj)) {
            String treeCode = paramsObj.getString(GenConstants.TREE_CODE);
            String treeParentCode = paramsObj.getString(GenConstants.TREE_PARENT_CODE);
            String treeName = paramsObj.getString(GenConstants.TREE_NAME);
            String parentMenuId = paramsObj.getString(GenConstants.PARENT_MENU_ID);
            String parentMenuName = paramsObj.getString(GenConstants.PARENT_MENU_NAME);

            genTable.setTreeCode(treeCode);
            genTable.setTreeParentCode(treeParentCode);
            genTable.setTreeName(treeName);
            genTable.setParentMenuId(parentMenuId);
            genTable.setParentMenuName(parentMenuName);
        }
    }

    /**
     * 获取代码生成地址
     *
     * @param table    业务表信息
     * @param template 模板文件路径
     * @return 生成地址
     */
    public static String getGenPath(GenTable table, String template) {
        String genPath = table.getGenPath();
        if (StringUtils.equals(genPath, "/")) {
            return System.getProperty("user.dir") + File.separator + "src" + File.separator + VelocityUtils.getFileName(template, table);
        }
        return genPath + File.separator + VelocityUtils.getFileName(template, table);
    }
}
